Medvedev lost control and produced an almighty rant at umpire Jaume Campistol during his semi-final with Stefanos Tsitsipas.
The Russian wanted the official to warn his opponent's father against courtside coaching. Instead, it was Medvedev who received a warning before exploding with rage.
The 25-year-old was hit with a £6,000 fine for unsportsmanlike conduct and £3,000 for obscenity. However, these numbers pale in comparison with what Medvedev stands to win in the Australian Open final.
A victory over Rafael Nadal would bank the Russian £2,144,000 while a defeat to the Spaniard would see Medvedev walk away with £1,175,000.
The world number two wasn't the only one to face fines from the organisers.
Denis Shapovalov, who accused umpire Carlos Bernardes of being corrupt during his quarter-final loss to Nadal, was also fined for unsportsmanlike conduct.
The Canadian's total of £11,000 is the highest in the tournament, with Tsitsipas in second having been fined £9,700 for three separate coaching offences.
Nick Kyrgios, who claimed the doubles title on Saturday, has amassed £7,500 for swearing and racket abuse.